Explain Baseball

[JPinAZ]

It's also interesting in that there is no fixed time structure for the game. Football & basketball have their 15 minute quarters, hockey has 20 minute periods, soccer has 45 minute halfs. But baseball is played until 9 innings are up. Those 9 innings could take 1 1/2 hours, they could take 4 hours. But until 9 innings are up, the game isn't over. (I'm ignoring a called game after 4 1/2 innings).